Which type of wattmeter can’t be used for D.C?
Which type of wattmeter can't be used for D.C?
Right Answer is:
Induction type
SOLUTION
Induction type instruments
- Induction-type instruments work on AC supply only. This is based on the principle of induction motor, therefore called induction type instrument.
- We can use these instruments as an ammeter, voltmeter, wattmeter, and energy meter.
- The scale of induction-type instruments is quite uniform and extends over an angle of 300°.
- Currents up to 100A can be handled by induction-type instruments so that their power consumption is fairly large and cost relatively high.
| Meter | Measuring quantity |
| Permanent Magnet Type ammeter | DC current |
| Induction type ammeter | AC current |
| Moving iron voltmeter | AC and DC voltage |
| Moving iron ammeter | AC and DC current |